An update from my last post, I've since had my vision rechecked and I'm suffering from a complication of the original LASIK called Iatrogenic keratoconus. The vision in my left eye is so bad that it cannot be corrected by any kind of perscription, so I'm booked in for further surgery.
Optical Express have been pretty good about it, I'm booked in to see a guy called Jan Venter (who is actually listed on their website as their top practictioner) in mid-March for a proceedure called Corneal Cross-Linking. There is a chance this will fix my vision, at the very least it will stop it getting any worse and than I can have a look at getting it corrected a year down the line once healing has taken place.
Its not been the best news I've ever had, and its not something I expected to happen however I'm hopeful that it can be fixed soon - as the headaches I get from basically having only one good eye are really starting to bother me.